Portion of a chair



FIG. 1 is a front perspective view of a portion of a chair illustrating my new design.

FIG. 2 is a rear perspective view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a right side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

Features of the portion of a chair shown as broken lines form no part of the claimed design. 

CLAIM The ornamental design for a portion of a chair, as shown and described. 